Worked on the ppy/osu repository to address rotation UI robustness, focusing on resolving a bug related to angle normalization and wrapping at the 180-degree boundary. Applied strong algorithmic thinking and math skills to implement symmetric angle normalization, ensuring consistent and accurate display across all rotation points within the selection box component. Utilized C# for both the bug fix and codebase improvements, enhancing maintainability through clear commit messages and formatting updates. This work improved the user experience by reducing edge-case inconsistencies and delivering smoother rotation interactions, ultimately supporting better cross-device consistency in osu’s game development and UI development workflows.